Looking further, it seems that the BIOS is providing broken information,
see this snippet from dmidecode output:
Handle 0x007E, DMI type 41, 11 bytes
Onboard Device
Reference Designation: Onboard Intel Ethernet 1
Type: Ethernet
Status: Enabled
Type Instance: 1
Bus Address: 0000:07:00.0
Handle 0x007F, DMI type 41, 11 bytes
Onboard Device
Reference Designation: Onboard Intel Ethernet 2
Type: Ethernet
Status: Enabled
Type Instance: 1
Bus Address: 0000:07:00.1
and as a result we get ID_NET_NAME_ONBOARD=eno1 for both devices. So
udev tries to rename both interfaces to eno1, only one succeeds, the
other one fails due to a name collision. Would be nice to implement a
workaround for these broken BIOS data.
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https://bugs.launchpad.net/bugs/1578141
Title:
Predictable interface names partially broken with igb driver
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